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Java example source code file (RandomWalkerTest.java)
This example Java source code file (RandomWalkerTest.java) is included in the alvinalexander.com
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The RandomWalkerTest.java Java example source code
package org.deeplearning4j.models.sequencevectors.graph.walkers.impl;
import org.deeplearning4j.models.sequencevectors.graph.enums.NoEdgeHandling;
import org.deeplearning4j.models.sequencevectors.graph.enums.WalkDirection;
import org.deeplearning4j.models.sequencevectors.graph.exception.NoEdgesException;
import org.deeplearning4j.models.sequencevectors.graph.primitives.Graph;
import org.deeplearning4j.models.sequencevectors.graph.primitives.IGraph;
import org.deeplearning4j.models.sequencevectors.graph.primitives.Vertex;
import org.deeplearning4j.models.sequencevectors.graph.vertex.AbstractVertexFactory;
import org.deeplearning4j.models.sequencevectors.graph.walkers.GraphWalker;
import org.deeplearning4j.models.sequencevectors.sequence.Sequence;
import org.deeplearning4j.models.word2vec.VocabWord;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.junit.Assert.*;
/**
* @author raver119@gmail.com
*/
public class RandomWalkerTest {
private static IGraph<VocabWord, Double> graph;
private static IGraph<VocabWord, Double> graphBig;
private static IGraph<VocabWord, Double> graphDirected;
protected static final Logger logger = LoggerFactory.getLogger(RandomWalkerTest.class);
@Before
public void setUp() throws Exception {
if (graph == null) {
graph = new Graph<VocabWord, Double>(10, false, new AbstractVertexFactory());
for (int i = 0; i < 10; i++) {
graph.getVertex(i).setValue(new VocabWord(i, String.valueOf(i)));
int x = i + 3;
if (x >= 10) x = 0;
graph.addEdge(i, x, 1.0, false);
}
graphDirected = new Graph<VocabWord, Double>(10, false, new AbstractVertexFactory());
for (int i = 0; i < 10; i++) {
graphDirected.getVertex(i).setValue(new VocabWord(i, String.valueOf(i)));
int x = i + 3;
if (x >= 10) x = 0;
graphDirected.addEdge(i, x, 1.0, true);
}
graphBig = new Graph<VocabWord, Double>(1000, false, new AbstractVertexFactory());
for (int i = 0; i < 1000; i++) {
graphBig.getVertex(i).setValue(new VocabWord(i, String.valueOf(i)));
int x = i + 3;
if (x >= 1000) x = 0;
graphBig.addEdge(i, x, 1.0, false);
}
}
}
@Test
public void testGraphCreation() throws Exception {
Graph<VocabWord, Double> graph = new Graph(10, false, new AbstractVertexFactory());
// we have 10 elements
assertEquals(10,graph.numVertices());
for (int i = 0; i < 10; i++) {
Vertex<VocabWord> vertex = graph.getVertex(i);
assertEquals(null, vertex.getValue());
assertEquals(i, vertex.vertexID());
}
assertEquals(10, graph.numVertices());
}
@Test
public void testGraphTraverseRandom1() throws Exception {
RandomWalker<VocabWord> walker = (RandomWalker) new RandomWalker.Builder(graph)
.setNoEdgeHandling(NoEdgeHandling.SELF_LOOP_ON_DISCONNECTED)
.setWalkLength(3)
.build();
int cnt = 0;
while (walker.hasNext()) {
Sequence<VocabWord> sequence = walker.next();
assertEquals(3, sequence.getElements().size());
assertNotEquals(null, sequence);
for (VocabWord word: sequence.getElements()) {
assertNotEquals(null, word);
}
cnt++;
}
assertEquals(10, cnt);
}
@Test
public void testGraphTraverseRandom2() throws Exception {
RandomWalker<VocabWord> walker = (RandomWalker) new RandomWalker.Builder(graph)
.setNoEdgeHandling(NoEdgeHandling.EXCEPTION_ON_DISCONNECTED)
.setWalkLength(20)
.setWalkDirection(WalkDirection.FORWARD_UNIQUE)
.setNoEdgeHandling(NoEdgeHandling.CUTOFF_ON_DISCONNECTED)
.build();
int cnt = 0;
while (walker.hasNext()) {
Sequence<VocabWord> sequence = walker.next();
assertTrue(sequence.getElements().size() <= 10);
assertNotEquals(null, sequence);
for (VocabWord word: sequence.getElements()) {
assertNotEquals(null, word);
}
cnt++;
}
assertEquals(10, cnt);
}
@Test
public void testGraphTraverseRandom3() throws Exception {
RandomWalker<VocabWord> walker = (RandomWalker) new RandomWalker.Builder(graph)
.setNoEdgeHandling(NoEdgeHandling.EXCEPTION_ON_DISCONNECTED)
.setWalkLength(20)
.setWalkDirection(WalkDirection.FORWARD_UNIQUE)
.setNoEdgeHandling(NoEdgeHandling.EXCEPTION_ON_DISCONNECTED)
.build();
try {
while (walker.hasNext()) {
Sequence<VocabWord> sequence = walker.next();
logger.info("Sequence: " + sequence);
}
// if cycle passed without exception - something went bad
assertTrue(false);
} catch (NoEdgesException e) {
// this cycle should throw exception
} catch (Exception e) {
assertTrue(false);
}
}
@Test
public void testGraphTraverseRandom4() throws Exception {
RandomWalker<VocabWord> walker = (RandomWalker) new RandomWalker.Builder(graphBig)
.setNoEdgeHandling(NoEdgeHandling.EXCEPTION_ON_DISCONNECTED)
.setWalkLength(20)
.setWalkDirection(WalkDirection.FORWARD_UNIQUE)
.setNoEdgeHandling(NoEdgeHandling.CUTOFF_ON_DISCONNECTED)
.build();
Sequence<VocabWord> sequence1 = walker.next();
walker.reset(true);
Sequence<VocabWord> sequence2 = walker.next();
assertNotEquals(sequence1.getElements().get(0), sequence2.getElements().get(0));
}
@Test
public void testGraphTraverseRandom5() throws Exception {
RandomWalker<VocabWord> walker = (RandomWalker) new RandomWalker.Builder(graphBig)
.setWalkLength(20)
.setWalkDirection(WalkDirection.FORWARD_UNIQUE)
.setNoEdgeHandling(NoEdgeHandling.CUTOFF_ON_DISCONNECTED)
.build();
Sequence<VocabWord> sequence1 = walker.next();
walker.reset(false);
Sequence<VocabWord> sequence2 = walker.next();
assertEquals(sequence1.getElements().get(0), sequence2.getElements().get(0));
}
@Test
public void testGraphTraverseRandom6() throws Exception {
GraphWalker<VocabWord> walker = new RandomWalker.Builder(graphDirected)
.setWalkLength(20)
.setWalkDirection(WalkDirection.FORWARD_UNIQUE)
.setNoEdgeHandling(NoEdgeHandling.CUTOFF_ON_DISCONNECTED)
.build();
Sequence<VocabWord> sequence = walker.next();
assertEquals("0", sequence.getElements().get(0).getLabel());
assertEquals("3", sequence.getElements().get(1).getLabel());
assertEquals("6", sequence.getElements().get(2).getLabel());
assertEquals("9", sequence.getElements().get(3).getLabel());
assertEquals(4, sequence.getElements().size());
}
}
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